From my Grandma's kitchen.

Mix:

1 cup butter
1 cup brown sugar
2 cups flour

Pat into greased 13 x 9 inch pan and bake at 350°F for 20 minutes.

FILLING:

2 cups brown sugar
4 eggs
2 tsp. vanilla
1 tsp. salt
4 tbsp. flour
1 tsp. baking powder
2 cups coconut
1 1/2 to 2 cups walnuts, chopped

Pour filling over baked crust. Return to oven and bake for 20 to 30 minutes. Cool 5 minutes and cut.